The centre-back was making his first start of the season and was set to make it through the 90 minutes as the visitors led 2-1.

But he clutched his thigh before hobbling down the tunnel and was examined by a City doctor as Guardiola's side hung on to progress to the fourth round where they will meet bitter rivals Manchester United.

City's Spanish boss said: "The doctors are speaking with him and seeing what's up.

"Hopefully it will not be a big problem, we're going to wait for the results from the doctors.